Microsoft · KEYS: Fix add_key() race with keyring restriction
Affects MicrosoftSource GCVE Database
Not known to be exploited · fixed in f99399b48e3edd6851fac34cd329bab9f1f33baf : patch Microsoft soon.
Data as of 7 Nov 2026, 12:35 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
Thin evidence
One scorer or none- Patch
- Available – fixed in f99399b48e3edd6851fac34cd329bab9f1f33baf, dd3ea3fcba7c75493760cdbccd35f029597e8d5e, da0b595d8e6e2dd798f6e34e09dc51a13b888514 +5
Exploitation evidence
Disclosed: evidence found.
CVE published 23 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 7 Nov 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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Description
CVE-2026-99040 is a vulnerability in Microsoft products version 3.0 and 4.0 related to a race condition in the add_key() function with keyring restrictions. The vulnerability has been published but lacks detailed technical or impact information and no CVSS score is assigned.